Answer:
The correct answer is A
Explanation:
The journal entry for the following is as follows:
August 9     Accounts Payable A/c..............................Dr    $4,200
            Inventory A/c...............................................Dr    $84
                    To Cash A/c..............................................Cr   $4,116
Working Note:
On August 5, the amount of $600 goods returns from customer, so the remaining balance is
= $4,800 - $600
= $4,200
On the remaining balance, the discount which is evaluated as the payment is received within the discount period which is August 9. So,
= $4,200 x  (100% - 2%)
= $ 4,200 x  98%
= $ 4,116
Discount = Amount - Payment amount
        = $4,200 - $4,116
        = $84